it comes with a 1.3-inch Plastic OLED (P-OLED) full 360-degree display.
The R comes with a 410mAh battery, a mere 10mAh improvement over its square counterpart. That means we shouldn't expect to get more than a day or so on a single charge.
Nearly all of the other guts are the same, too. It comes with interchangeable 22mm straps, a 1.2GHz Qualcomm Snapdragon 400 chipset with 512MB of RAM and 4GB internal storage. It's also rated IP67 for water resistance (up to one meter of water for thirty minutes), just like the last one was. However, there's two notable new features: It comes with a heart rate monitor underneath and what appears to be a power button on the side.